Lubricating pump



March 1942- J. w. KINNUCAN QLUBRICATING PUMP Filed May 11, 1940 Sheets-Sheet 1 o o o J. -w.' KINNUCAN 2,278,110

. LUBRICATING PUMP March 31, 1942.

5 Sheets-Sheet 3 NVENTOR. I d 5 moucan BY "g z ATTORN March 31, 1942. I J. w. KINNUCAN 2,278,110

LUBRICATING PUMP Filed May 11, 1940 5 Sheets-Sheet 4 ATTORN March 31, 1942. J, W INN AN 2,278,110 LUBRICATING PUMP 5 Sheets-Sheet 5 Filed May 11. 1940 Paiented Mar. SE, 1942 LUBRICATING PUMP .Iames W. Kinnucan, Detroit, Mich, assignor, by mesne assignments, to Continental Aviation and Engineering Corporation, a corporation of Virginia Application May 11, 1940, Serial No. 334,675

3 Claims.

by rearranging the component parts of the pump.

Internal combustion engines and particularly those manufactured for use in propelling aircraft are made to have crankshafts rotating in either direction; that is, right-hand drive engines are manufactured as well as left hand drive engines. Usually it is the practice to provide two different pump assemblies, one which is adapted to be drivingly connected withthe right hand drive engine and the other to be drivingly connected with a left hand drive engine. Consequently, it is necessary to provide twoccmplete and distinct pump assemblies, and to carry duplicate service parts as well as necessitating duplicate dies, fixtures and patterns for manufacturing these different pump structures.

An object of my present invention is to eliminate the difiiculties aforesaid by providing a pump structure having component parts which may be assembled together in a predetermined arrangement for assembly with either a right or left hand drive engine; in other words, the present pump construction may be assembled with an engine having a pump driving shaft rotating in a clockwise direction or with an engine having a pump driving shaft rotating in a counterclockwise direction.

Another object of the present invention is to facilitate the manufacture and assembling of oil pumps for engines of the type described above by providing a sectional pump assembly embodying complementary pump portions which may be readily assembled in a predetermined relation for P driving assembly with such engines.

A further object of my present invention is to provide an improved lubricating pump structure adapted for assembly with engine driving members or shafts having a clockwise or counterclockwise rotation by providing reversible pump sections which may be assembled together in a predetermined relation in order to be adapted for driving assembly with these engine drive shafts aforesaid.

For a more detailed understanding of my invention, reference may be had to the accompanying drawings illustrating a preferred embodiment of my invention in which like parts are referred to by like characters throughout the several views, and in which:

Fig. l is a side elevational view of an engine transmission assembly showing my improved lubricating pump assembled therewith,

Fig. 2 is a plan view thereof illustrating an engine drive including a pump drive shaft rotating in one direction,

Fig. 3 is a fragmentary plan view similar to Fig. 2 but showing an arrangement in which the pump drive shaft is rotated in the opposite direction to that shown in Fig. 2,

Fig. 4 is a detail fragmentary elevational view of-two part engine transmission assembly, showing the pad on which the lubricating pump is assembled and illustrating the lubricant inlet and outlet openings formed in said engine transmission assembly,

Fig. 5 is an assembled sectional view through the pump assembly taken substantially on the line 5-5 of Fig. 1,

Fig. 6 is a vertical sectional view through the I pump assembly taken on the line 6-6 of Fig. 1,

Fig. 7 is a sectional view through the pump taken on the line 1-1 of Fig. '6,

Fig. 8 is a sectional view similar to Fig. 7 but showing the pump reversely assembled for oper ative connection with a' pump drive shaft rotating in the opposite directions to that shown in Fig. 7 and which is adapted for assembly with the mechanism generally illustrated in Fig. 3,

Fig. 9 is a sectional view through the pumptaken on the line 9--9 of Fig. 6,

Fig. 10 is-a sectional view similar to Fig. 9 but showing the same reversed for assembly with a reversed pump construction,

Fig. 11 is a plan view of the pump, particularly illustrating the construction of the outermost pump casing part, and

Fig. 12 is a fragmentary diagrammatic view illustrating a portion of the external lubricating system. v

The pump structure illustrated and described herein preferably consists of a structure formed of complementary portions assembled together and indicated as a whole by the reference character A, and bolted or otherwise secured to an exterior portion of an engine gear transmission indicated as a whole by the reference character B. The internal gearing mounted within this transmission is not claimed per se in this applicaarrow Ila in Fig. 3 illustrates the direction of rotation of the engine associated therewith.

It will be noted that the direction of rotation of the engines respectively connected with the assemblies of Figs. 2 and 3 are reversed with respect to each other. The gearing embodied in the transmission B includes a bevelled gear I2 drivingly connected to the driving shaft I0, this bevelled gear I2 meshing with another bevelled gear I3 which drives the pump drive shaft I4, arrows l5 indicating the direction of rotation of the pump drive shafts I4. It will be noted though, that the pump drive shaft I4 in Fig. 3 rotates in the opposite direction with respect to the pump drive shaft I4 of Fig. 2. I

The transmission B comprises a casing or gear box structure consisting of upper and lower interchangeable sections I6 and. I6a. -In Figs. 1 and 2 the assembly is adapted for a right hand drive engine, but when adapting this transmission assembly to an engine rotating in the opposite direction, it is necessary to turn the transmission assembly over, in which event the upper section of the casing is |6a while the lower casing is I6, exactly the reverse from that shown in Figs. 1 and 2. Preferably, the transmission structure is rotated through an angle of 180 degrees about the axis II which is coaxial with the engine'crankshaft I8. These interchangeable gear casings I6 and l6a are constructed identical to each other, and it will be noted by referring to Fig. 4 that each of the casings l6 and |6a are provided with casing ports I9, and I9a, 20a.

Referring particularly to Figs. 6, '7, 9 and 11, it will be noted that the pump drive shaft I4 is drivingly connected with the pumpshaft 2| in any suitable manner, such as by a tongue and groove connection 22. The pump structure consists of three complementary parts or casing sections, the inner one designated as a whole by reference character 23, the middle section by the reference character 24, and the outer section by the reference character 25. Suitable bolts 26 are employed to secure the pump unit to the transmission casing B and it will be noted that these bolts pass through the pump sections or portions and securely bolt the pump assembly to the easings I6 and lid of the transmission B. Prefer-' ably, the inner pump section 23 is bolted to the transmission casing by bolts 21, said section 23 seating on the pad 6| carried by said transmission casing and causing the ports I9 and 20' to respectively register with the casing ports I9 and The operation of the pump when assembled in the relationship shown in Figs. 6, 7, 9 and 11, is as follows. The lubricant or oil is scavenged from the translr'ssion case through the scavenge port I9. The lubricant or oil is thus carried through the passage or chamber 28 and is pumped into the chamber 29 by means of the gear pump assembly supported within this pump section 23. It will be noted that the pump gear 30 is supported on the shaft 3| and meshes with the pump gear 32 keyed to the pump drive shaft 2|. The lubricant or oil is caused to be pumped into th chamber 29 from chamber 28 and thence flows outwardly through the port 33 into the chamber 34 carried by the pump section 24, and thus outwardly through port 35 into the chamber 36 in the pump section 25 then outwardly through the oil line or conduit 31 into a tank or reservoir 38 in which oil cooling devices 39 are preferably assembled.

The oil or lubricant is taken from this tank or reservoir 38 through an oil line or conduit 40 into a chamber 4| carried by the pump section 25. Thence inwardly through port 42 into the chamber'43 in the pump section 24. The oil is then pumped by the gear pump assembly which includes a driving gear 45 driven by the pump shaft 2| into the chamber 46. The oil flows through the port 41 into the chamber 48 carried by the pump section 23, and thence through this chamberand out through the port |9b into the oil passage |9a in the transmission case.

If, for any reason, the oil line or passage |9a becomes clogged or stopped, and theoil is prevented from flowing into this line, the oil is forced to take another path, same being caused to flow through the port 5| into passage 52 and into the passage 53 which terminates in an outi let 54 closed by a spring pressed valve 55 commonly referred to as a pressure relief valve. The oil pressure will lift the valve off its seat and will permit the oil to flow into chamber'56 (see Fig. 11) from which chamber the oil flows into chamber 4| which is constructed in open communication with chamber 56. Thus the. oil is merely by-passed so as to flow again and again through the oil pump structure 44, identified as a pressure pump.

Referring to Figs. 8, l0 and 11, it will be noted that the pump section 23 is turned over which brings the face of pump section 23 into an abutting relation with the pad 6| carried by the transmission casing. It will be noted that the ports is and 20 carried by the transmission casing are interchanged with respect to the ports |9a and 20a because of the fact that the transmission casing sections I6 and |6a have been interchanged, and the pump section 23 is also reversed in order to respectively register the ports I9b and 20b with the ports I9 and 20. It will be noted that the transmission ports register in both positions with the pump casing ports, and that ports I9 and 20 (see Fig. 4) are scavenging oil outlet ports and that the ports |9a and 20a are connected with the oil pump outlet ports. When the ports are assembled as in Fig. 3 the ports |9a and 20a become the scavenging oil outlet ports and ports I9 and 20 are connected with the pump outlet ports. The oil flowing through the pump casing port 20 and port 20, flows into the passage 62 then by the gear pump-element 63 into the passage 64, then outwardly through port 65 into the chamber 66, then outwardly from chamber 66 through port 66a into the chamber 36 in pump section 25, where it joins the oil coming from port 35 and goes outward through the oil line or conduit 31.

It will be noted that the circulation of oil through the pump assembly illustrated in Figs. 8, l0 and 11 is through the same passages and chambers as illustrated in Figs. 6, '7, 9 and 11 and this is accomplished by reason of the fact that the pump drive shaftv 2| is rotated in the opposite direction. In Fig. 8 it Willbe noted that the pump section 23 is turned end for end whereas the pump section 24 is rotated about the pump shaft 2| through an angle of degrees (see togetherin either one of two predetermined relations. Thus, I have provided a pump structure which is adapted for assembly with pump driving means rotating in two different directions. These two pump assemblies embody identical pump sections, and it will be readily seen that the manufacture of pumps of this character may be had with a minimum of tool and fixture expense. Furthermore, these pumps can be more economically serviced because of the elimination -of the necessity of carrying duplicate service parts. Either type of pump can be serviced with the same part.

The present pump construction is particularly adapted for assembly with a reversible gear transmission assembly such as is illustrated and described in my co-pending application aforesaid, the pump inlet and outlet portsbeing designed to respectively register with the casing outlet and inlet ports in both assemblies illustrated in Figs. 2 and 3.

Although I have described in detail but one embodiment of my invention, it will be apparent to those skilled in the art to which my invention pertains, that various modifications and changes may be made therein without departing from the spirit of my invention or from the scope of the appended-claims.

I claim: 1. A reversing liquid gear pump assembly coming portions, one of said casin an inlet port and an outlet port, said portions prising a plurality of complementary pump casing, portions, one of said casing portions having an inlet port and an outlet port, said portions having interconnecting passages constructed to provide continuous passages for the flow of liquid in the same direction from said inlet port successively through said casing portions and thence returning same successively through said casing portions to said outlet 'port, gear pumps supported within at least two of said casing portions, and adrive shaft drivingly connected with said gear pumps, one of said casing portions including the 'gear pump carried thereby con-.

structed for angular adjustment through an angle of 180 degrees about an axis normal to the drive shaft axis while another of said casing portions including the gear pump carried thereby is constructed for angular adjustment through cessively through said casing portions and thence returning same successively through said casing portions to said outlet port, gear pumps supported within at least two of said casing portions, and a drive shaft drivingly connected with said gear pumps, one of said casing portions including the gear'pump carried th'ereby constructed for angular adjustment through an angle of degrees about an axis normal to the drive shaft axis while another of said casing portions including the gear pump carried thereby is constructed for angular adjustment through an angle of' 180 degrees about the drive shaft axis, whereby to adapt said pump assembly for reverse rotation of said drive shaft, said gear pump as sembly including at least one casing portion whose position remains unchanged while the other casing portions are relatively adjusted as aforesaid.

3. A reversing liquid gear pump assembly comprising a plurality of complementary pump casportions having having interconnecting passages constructed to provide continuous passages for the flow of liquid from said inlet port successively through said casing portions and thence returning same successively through, said casing portions to said outlet port, gear pumps supported within at least two of said casing portions, and a drive shaft drivingly connected with said gear pumps, one of said casing portions including the gear pump carried thereby constructed for angular adjustment through an angle of 180 degrees about an axis normal to the drive shaft axis while another of said casing portions including the gear pump carried thereby is constructed for angular adjustment through an angle of 180 degrees about the drive shaft axis, whereby to adapt said pump assembly for reverse rotation 'of said drive shaft, said gear pumps being thereby reversely actuated but cooperating with the interconnecting passages in said casing portions to induce flow of liquid through said passages in the same direction.

JAMES W. KINNUCAN. 

